21202121101000 has 96 divisors (see below), whose sum is σ = 57713039163000. Its totient is φ = 7269298646400.

The previous prime is 21202121100983. The next prime is 21202121101027. The reversal of 21202121101000 is 10112120212.

It can be written as a sum of positive squares in 4 ways, for example, as 3835181723044 + 17366939377956 = 1958362^2 + 4167366^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216299175 + ... + 216397174.

Almost surely, 2^{21202121101000} is an apocalyptic number.

21202121101000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202121101000 is an abundant number, since it is smaller than the sum of its proper divisors (36510918062000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202121101000 is a wasteful number, since it uses less digits than its factorization.

21202121101000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432696384 (or 432696363 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21202121101000 its reverse (10112120212), we get a palindrome (21212233221212).

The spelling of 21202121101000 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-one million, one hundred one thousand".